66915450 has 192 divisors, whose sum is σ = 215819520. Its totient is φ = 14929920.

The previous prime is 66915437. The next prime is 66915461. The reversal of 66915450 is 5451966.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 689802 + ... + 689898.

It is an arithmetic number, because the mean of its divisors is an integer number (1124060).

Almost surely, 2^66915450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66915450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107909760).

66915450 is an abundant number, since it is smaller than the sum of its proper divisors (148904070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66915450 is a wasteful number, since it uses less digits than its factorization.

66915450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 66915450 is about 8180.1864281934. The cubic root of 66915450 is about 405.9838904202.

The spelling of 66915450 in words is "sixty-six million, nine hundred fifteen thousand, four hundred fifty".